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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1234d6ab0fa6b8d4bcd7a282d0f42208d9410f740af3de7281171eb225db142a' 
  AND token = 'febBLtsVz2nlGitGfqgcvt63MwaibPWtbnreYgycVFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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