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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8cd42c8e7a2df7c088c2e917b1506921305a6e2139f0fc9b413bb8c9c325dd' 
  AND token = 'IWeSWZFzj6ORgVGEvga2o4aJvf9v9p75cN94gwogo4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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