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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97759f1c1b3df6fba4822eecdc78a743061ecc4a00c5a70f618a947b13e845d9' 
  AND token = 'b3g6XarHgHmF7wP07k54RbJQ/wbcgZyPoQ/xeZhLWO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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