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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6223aa40aac264d03e44663bc8472d8a2a443347b2c725d6a3bcdca1356d781c' 
  AND token = '6VnovEPsxDJmvQTggOjHmhR5jHYntTTHtfw115VqOEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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