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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25aca5255acd46e2a8ddc7e470aea0507e846d865ddd0e207cae4497ed6f59ea' 
  AND token = '4jC9K2Lykz1qB6OCkVcCiE0rijbNjTtuVxYKXdVbXDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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