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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4784b254924f9dd85516174b4437dacb093cba4a095c5322be4bb3d46d0c85f' 
  AND token = '3e8RY4CNV5IjOyyBk0zVq+boEQUHvYIjwvfuCMTTBZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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