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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b756f6c4b2a4c8b43e589a14f1d4e646f10e0d5d0ce41a12d627839e78b99f9' 
  AND token = '2FhWtJVCzthbTRPQFAfrInx/bm5H9+/XCIbpb4Qy5uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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