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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce228fe73d357faa0aa2cd52169f0267d3931418756041bd932f32561901000b' 
  AND token = 'Y5zBRIYZd0wYXoXN8LbpupXgL4A6dfspdLRdSE7hgno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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