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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a9682d8f1778724b110d6adb3286842115950a9c1ad280f5efa34a508f9dc9' 
  AND token = '174ruPCGxTUlNZktpmdIvRRaMksBK4/ZWBIEhjqSRoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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