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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322584c7996836294630a1ee7e1c4be4e0d5e8a1058ebabbb2c5182005db2d0d' 
  AND token = 'RMylH9R1dOayU5iCJww1WYgiQ0v7tvO7sJ6uqrJwKGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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