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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40d384df96fdae72a45d9db834ad7ab261213a18592b10328b20e3a4d00e4f1' 
  AND token = '8oKMGa35+2Fjp1i5LV10twmW9A4fT9yhT7xwLRMH1Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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