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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb8c090111c62a4deaa2a2ef43160ef4561a818a0017206368aca3d1ce496c0' 
  AND token = '/+4LS50uqYalPtjPABJOArW/brSBKPBxdZiyLOiqw1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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