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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e353218a32b9e72ed2fd9bf7dd0d5c7b9ae60bce4a155b6b07982bb5b2ada4a1' 
  AND token = 'vO3zK7gPi1yp67pcZ9AgcPbS5tfPkUEHZPNXroSFDis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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