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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eadd75db8f01309e66e3c9b60a87aeaa0dcde4d96299d52b764ad309fc428e37' 
  AND token = 'mPXaQhzqSCkOFskXiyZIghbejy05CE/0SMMUmW1ZdaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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