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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee17ce21ffa6375f4662cc3e1038500a6ce87ab245456b9fb6e6f7dba71f27bc' 
  AND token = 'isd0XFCL724s0dmEugViWGdQBT1I4OCi9mX9prQ9IwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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