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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8280f4db0cd1af8042457129368bd4008c59f753b5f723992fa5e244604d7d' 
  AND token = '1YeWA9LgKdJibF4HPXv7zJZJBu353N6DCSVXtySC6co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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