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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eafa47622bae533cf0bffac9b0a20c6dd0a55af06ae5f739ac4f306897e8591' 
  AND token = 'ImuZFEUoy+mr0rG4q19TlN00d6xMmlFl8tBJKapyC+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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