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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa9b74f29d977a8f25dcb2bb397c55a8f6e75ccff9a8b68585efe78e40e9ada' 
  AND token = 'fyyH94skYoYq7cFvuzdRpabubE6z0GAIWKOnf5F8EJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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