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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed73cb766d1b93efdf2c30d243efa287f37022b82e69567bad6c84ea9823e2e' 
  AND token = 'Ri8iNAyBQFQ1gmZUH+kWwZMgrF54n/sD8+EIOrE++lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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