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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe3a20fcdc841f04a39654e1c1a01c437e0ab8da506b09ac5092d6813ef1de0' 
  AND token = 'pSi7QsjqhEgfsRQzQkJ0xmIvYK5jGy6GTk9vg9rdZtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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