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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4962c3b2d3c8e611e89bee835d3c1ac3496b8fe0fabbf6c3f4086756f4b14385' 
  AND token = 'f7h0JhwlMfWwYsV93G2Q5PKQcBy4VtIiR+3B03ltigg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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