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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ba705f93d3641036947b01f004ded4ec9af5d43368e765825c2e5f787cf34b' 
  AND token = 'fultrLmGzquBi1oEksCah2iWrEMzRpPSn46EWCIqsRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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