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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b505a21d04e61d92142b2aecb8f32509fc5769a7e69ad624c6427f8a34cf3df9' 
  AND token = 'B0Z9klmUHwKGR0UpWnkgO0N62UygZirLKYbbG6dMxjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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