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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710854e4ca216d6d122f0de083978263d72a581326569e7976e2a3916b9ece47' 
  AND token = 'pFrPSGXeNX0tmORr+eROrqP73qDQSIWHNJZk+zHDz/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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