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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72d027bc084d7e65b61eacd2e77bd77dfe28d3d8a7d85ee86351ab4eb25f40e0' 
  AND token = 'sYAeK8FRPow7XYLdwDzufzlBx/nr42OeqirAoi8SDsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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