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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacaaa35a40e91fad47f686d8bc620fd5704e76ddda3678dfdf4dc23a2d03067' 
  AND token = '3DAWF1OR7+5mVzP0qe1RQclz1N7J7eYF6nCKSwxL4/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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