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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85dbc53ea8b5442a5a5ffea9605025f128f25a142692bd097f900df4369284b2' 
  AND token = 'tqw1/H0pt7gngMkxg8hZ8jPPJ1+9zPk8hA3dTWcHGTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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