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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d60c88de640dd54e96820f86aa0fd9bef6ba9f7bead38890995524a943284f7' 
  AND token = 'VJVcc/gpD8uBAzo9ljYXaqdXPbOv6/0VvpouMW/W2dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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