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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f641669f1462e4ae3d52a21a52e2134b1f813ea2f65ac72b3d3fa2d474a30e7e' 
  AND token = 'LLjjUGCYgQsg2wycPqRHM3gws11b5IF7v0xd5q+Rqvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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