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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cff1f43a1e34698e2629907a2531904ad32ace97cfa0841f8ac4f9e4a5f4fe5' 
  AND token = 'zG4xBmQMLarekISTqgZty7bMj/dLaqdW2/HE1w1cJnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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