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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bb9b4c19c7026ecddafa434e058b26a48a70c9107e2e2d94d469c21f040cde' 
  AND token = 'YPChnkkKNoiZIN8cdA7hvse2raU0J0CojC45PY75o4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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