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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b7a2abc7a8972758b799bae3964bda58539ad2d305334305914074c7103e93' 
  AND token = 'LRAQf9JEaQSJ/rFslUalnj3d73IkPSaw+ufDxeizLfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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