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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '979cf3f7ac9d0e4bb8398c7fc3f76d972edefab6e90e412bd9f75c71f53cc446' 
  AND token = '3rQTqnVoJ3BS3IzITHwlOI0UPyCHadcT+hqA4jOjZP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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