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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db524e9ce36501c951c81d92abd2eb3e9904ceb05b6c120a7b91ebf60c4bfe5' 
  AND token = 'n8cPLrIHe8BonMYMXIWWV44MBIFSIs23PtV3i34UW1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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