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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ac007d9c0126c9d5f44ed93c7378a750632874ded7ac0429334e8f15e08619' 
  AND token = 'HGu6xG8uzsW6DY6WOykquxzRf28fJWZpaX70uSu3GX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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