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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b9a5d0e09141ab0d2332d83448ce9e19d4bee4de5378965f04196637f385c5' 
  AND token = 'h28/+ySoMRM00fOuKfDghHLFjpkxT0dop7ZM8eC5NLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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