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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5c3f7958eed4a351ce49cfe57991f0357f982dc5f1dc43920be0a888afa448' 
  AND token = 'qy/3aZsI0LciHIwSpCEPsNILfQj2mHSqAkk3aZNvqJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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