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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813fe999fc269ae781608646b80bb5017f8bf376251f7ff2c036dc105c84983a' 
  AND token = '/Yc0q2ff5OjHI0V8T5PUivIHdFs+KsFCqw04qGNyqCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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