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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ded1cf1e83332f0339e6cfd9e225325eb8933ff83d3e8a2c406d7a1e4539e0' 
  AND token = 'DT+dtsnXGsuAqC/PXnVHsJJKIWjWH2fMQCsgazjEWVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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