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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc9fa74d67850b943e3fb475293ab1cd150b7c95254bdd7e3d48f2249c482df' 
  AND token = 'rqISfUL1SQnLyYlRgaDznHydlN2xz3DZPfAzn7mYIQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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