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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4cd22bef68fa1a9b6d85fb8ceae9d674001319a30b7fe4789003f5d9dc9219' 
  AND token = '5Yur5Wrd5g6lLBbKMVPMWKwleDxoSqWovILKiwTJ26Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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