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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c509f731ffa7a2a96331ce6f2ba0bfc52e0136016626aaf03ad4affddf4a0c6' 
  AND token = 'MisvQ5aNWCLv0Rfa8ODS/ReYW+TE8Dm4Fnq4TsTyc1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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