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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878c5119b6733ec4449119fdc9496d9588449110301e950ee9af8941551a2e35' 
  AND token = 'mjzAHVNc9xwjJFROjf2CpatXxpzdkIISjTdLPZX6ovE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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