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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b52e49358c727107927a5e85bfbda24fa6698f12554033b519abfe6edb93ae' 
  AND token = 'aWMtH7TLshDghA3AnjkLKz+ntFDB1W5l9mfDF/Vx2dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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