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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173018f31b45b50187d265868bc120e87734483f8df266e60e8aaaa5b6aa971a' 
  AND token = 'hvZgikDmfWE3heTNWPjqP2ywbwOlH6IE+IgR4XYTVTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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