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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da54f15b36cd58e812f3dcaccf96413d8096fad7df578feb0deb1ecad403902' 
  AND token = 'o13vope5AQTwMS4rdm8r/6cFwv04ztfjDVesEmcBGAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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