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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61c7b86f90d6404bbfe1bedc54d5a813d66f2133ad1813bce3a34ff36519bad' 
  AND token = '1kyfBbuVc98840Z0CJDMu7O6Mv7NOX10PL218CecJ2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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