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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe7b9ac25057248d8b85e6af6cee01564f8c49380a53e8b863855ab67ebdb91' 
  AND token = 'JX3w+qJHrPg+CHoQ69QUVCNw3+7F5JJlkdicmg3tMB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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