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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa05c1e4cb7971223b696a07d4d4c6c33ff9e8731aca2da8331c3f35e18874a9' 
  AND token = 'KgIALbrv1imKQWnjfLAq3cGM95uGHRg1SV5d11nujQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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