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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee70831065974e5f765a5d774aa102280384eb527d24a57512ca7480b33c897b' 
  AND token = '+UUORqENoGumhSyE9a/dydVB7bvtKtfS5XqbNfLBA4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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