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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8914350e34da26c0d283f75d32fdc0aca9002ea6ff02c4c39010fc0a210efb58' 
  AND token = '4WZ3ZitjHb6wm9TKvE2jaapff0kO5zFciUwBo0khlVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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