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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee42eb360756a1e3052d696a0bb33c6cd0e61579ac93f29f2208ba380b93784' 
  AND token = 'WW1t9dqMdGQFmhxUPge7IfmEv228xJ1yNfNyEnhpr88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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