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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8493a59a5c8351163f90482d000339e4e0ab31e5b7f5b75a74ab928b5d04fc' 
  AND token = 'SeCrkK5+Z4wN+wACJI/2571V5pZWjUhoRLRbBFCt63E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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