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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8cf6b86b72141f872389e29d1fce3de4daf06ff61159009e91b97f1f24bde9' 
  AND token = 'qTq/uPHL062PwF3tPU1k9zqxm5HOqyMSuxBY1+breJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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