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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6f37fa8711e53b5b883ee44219f38098dff25c1d8fd5524edd53a1c5ce2eed' 
  AND token = 'ZKG8UNqPU8A3K7qONPwzWztUs2upVxH2NeWE8jnF7fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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