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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d53bab6bb61e282f8e91a7d0fda8c53db490dfe9d5d2162aec8d6a793f1b92' 
  AND token = 'zh7Eaicstyn7YcRQvYp2dY2qifq0+tPAgVVDJTfdcOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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