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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef83c4a0fa68c75c85d551d85ee24d6af9ca0f6e5652646f16ba3e77be6d0f4' 
  AND token = '+/8kisvlD7JNZWaxy2gQE1XQqCNXBEYNJ34v4mSj+0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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