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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f3f1bd724f209c57252759499b3eed02991276f2561d482ae816937ec9a813' 
  AND token = '8PQ3549Hd03SZNV9fWJEYoiWuEKQ3IRpray1dFpOaaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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