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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2331ae679af152afb188db5400939600d3ad0f44233da00a0b6b62d7fd5a5a5' 
  AND token = 'xhs1VfO1dMnmR880VrB0b86s4xArbeNUrgqGzkbvIZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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