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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a8ea5329d3aaa6b190ad1005fa3dbd95bad561885acb9a45e5b1793f1177b1' 
  AND token = 'oAf22VlD2fmN3FzGl3rlaGa2leg2GLqKhzESXC/FX84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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