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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5a0f8bab3fd94777795c816baaaaf160c34dbb567bfcfe7adcd6b890b70233' 
  AND token = 'hJ/ow5VabWyQfWPrzDutlgXsPbo2JAZF84m8hVr9O5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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