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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4557160f6e7da06cd786283fe18b1d2bb9b1186607821cb3bb2f858ed1c76b16' 
  AND token = 'Kp2aMqDK5ShBbo1j5ZZ47Gjo0Q85ItEAZn4VKy4qLCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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