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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f689ad0aa95c80a99ee191af841a3d7fd68d8cb64fb63b8638157dc99de29d' 
  AND token = '64k1+qDaltZhbHFgraqB/iswV20IcbcmJnkPQe5leRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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