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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6f24561655aa39f7ab0b35947170736a6da47e88e07d56353258a7eee6375f' 
  AND token = 'jOn0OvETVEz6U5iN11/YvWau3D/17us19J+feV6YMYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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