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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71210412158e4c9b0e969ff1549969315de1673f72603ae122c7f7a89dd9b2bc' 
  AND token = 'BWzr4IUYWv/19ZSTx3iAaEueSC4eP/PjGEfXaPobNfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}