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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b27ab9b8bf2401b35623aa808c4183ae903bfbf1880e4ea83e1aa121a9f531c' 
  AND token = 'HNp7B7oBkUM9nEsav9Sa5H2W2H93/ijfR1Xi6Ey4Wws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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