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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe017b58d5e4fa7bec99d9c740a781427a182c1c6137a40926f182b511e76c6' 
  AND token = 'tBkTFBX1JBij26Q9XGFbqzobUq+bA/re/hBGHDAM8iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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