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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc1e2637ba1e593d800412d4c02f030ea1a3e4cb07946cd593c9054c269298c' 
  AND token = 'o4ARj5hOU2IKJLCYIrFxTstGHVUhKIaNWHNt6qKcTec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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